Princess Sunbeam (earth pony) is red with yellow hair with dark pink tinsel.  She has a round shaped medallion with a pink jewel center.  She has lilac/light (cornflower) blue eyes.

Normal US Release, yellow hair with dark pink/red tinsel.

UK Variant, yellow hair with dark pink/red tinsel, pink tail no tinsel

UK Variant, yellow mane with dark pink/red tinsel, yellow tail with silver tinsel, clear symbol (prong out on both sides, mostly broken off on right/all broken off on left)

UK Variant, yellow mane with dark pink/red tinsel, yellow tail with No tinsel, princess dawns gem owned by princessluna11706 permission to use given by princessluna11706

Comparison shots of Gem stone - Variant compared to Dawn and
Normal Sunbeam compared to Variant, permission to use given by princessluna11706

MIB owned by collector1 - permission to use given by collector1